DM6381F datasheet(16/40 Pages) ETC

16 / 40 page

DM336P

V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set

Final

Version: DM336P-DS-F02

August 15, 2000

d. DM6383 Configuration Modes

The DM6383A is power-on in jumpless mode. The

default configuration is set by loading the default

value stored in 93C46 to Auto-configuration register.

These values can be modified by software via the

logical device configuration registers in DM Jumpless

mode. This update value of new configuration is only

valid temporarily and will be lost after an active PC

Hardware Reset. Permanent changes of default

configuration will be done by informing micro-

controller to modify the content of 93C46 via Auto-

configuration Register.

The Plug and Play logic can operate through two

configuration modes: One is DM Jumpless mode, the

other, PnP mode. There are two operating methods

between the two modes: First, setting hard

configuration through Initiation Key sequences,

second, setting hard configuration according to the

Auto-configuration Register.

(1) The Initiation Key for Plug and Play

The Plug and Play logical is in sequence on powering

up and must be enabled by softwares. This is

achieved by a predefined series of writes (32 I/O

writes) to the Address port, which is called the

Initiation Key. The proper series of the I/O writes is

detected, then the Plug and Play read/write data ports

are enabled. The Write sequence will be reset and

must be issued from the beginning if any data

mismatch occurs. The exact sequence for Initiation

Key is listed below in hexadecimal notion.

(2) PnP Initiation Key

6A, B5, DA, ED, F6, FB, 7D, BE, DF, 6F, 37, 1B, 0D,

86, C3, 61, B0, 58, 2C, 16, 8B, 45, A2, D1, E8, 74,

3A, 9D, CE, E7, 73, 39

(3) DM Initiation Key

68, 34, 1A, 8D, CB, E3, 71, B8, 5C, 2E, 97, 4B, 25,

92, C9, E4, 72, B9, DC, 6E, B7, 5B, 2D, 96, CB, 65,

B2, D9, EC, 76, BB, 5D

(4) Isolation Protocol

A simple algorithm is used to isolate each Plug and

Play card. This algorithm uses the signals on the ISA

bus and requires lock-step operation between the

Plug and Play hardware and the isolation software.

STATE

ISOLATION

ID BIT = "1H"

SD[1:0] = "01"

LEAVE SD[7:0]

IN HIGH-IMPEDANCE

GET ONE BIT FROM SERIAL IDENTIFIER

READ FROM SERIAL ISOLATION REGISTER

YES

WAIT FOR NEXT READ FROM SERIAL ISOLATION REGISTER

SD[1:0] = "10"

STATE

SLEEP

YES

ID = 0

OTHER CARD ID = 1

READ ALL 72 BITS

FROM SERIAL

IDENTIFIER

DRIVE

"AAH" ON

SD[7:0]

AFTER I/O READ COMPLETES

FETCH NEXT ID BIT FROM

SERIAL IDENTIFIER

ONE CARD

ISOLATED

YES

LEAVE SD[7:0]

IN HIGH IMPEDANCE

DRIVE "55H" ON SD[7:0]

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